<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 500px;
            height: 250px;
            background-color: rgb(0, 136, 255);
            border: 10px solid green;
            box-sizing:border-box;
        }

    </style>
</head>
<body>
    <div class="box">
    </div>
</body>
</html>